When you install CF on the HDR1100S, the main TV interface (the Freesat EPG and player) remains untouched. You navigate to a specific IP address in your web browser (e.g., http://humax/ ) to access the "basement" – the Web Interface.
While there is no dedicated "Custom Firmware" for the Humax HDR-1100S Go to product viewer dialog for this item. humax hdr1100s custom firmware